#include<stdio.h>
int main()
{
    //freopen("in.txt","r",stdin);
    int num[26] = {0};
    char c;
    while (scanf("%c",&c) != EOF)
    {
        if(c <= 'z' && 'a' <= c)
        {
            num[c-'a']++;
        }
        if(c <= 'Z' && 'A' <= c)
        {
            num[c-'A']++;
        }
    }
    for(int i = 0; i < 26; i++)
    {
        printf("%c : %d\n",'a'+i,num[i]);
    }
}